jQuery.fn.rotate = function(angle,whence) {
	
	$(this).each(function(){
		
		var p = this

		// we store the angle inside the image tag for persistence
		if (!whence) {
			p.angle = ((p.angle==undefined?0:p.angle) + angle) % 360;
		} else {
			p.angle = angle;
		}

		if (p.angle >= 0) {
			var rotation = Math.PI * p.angle / 180;
		} else {
			var rotation = Math.PI * (360+p.angle) / 180;
		}
		var costheta = Math.cos(rotation);
		var sintheta = Math.sin(rotation);

		if (document.all && !window.opera) {
			var canvas = document.createElement('img');

			canvas.src = p.src;
			canvas.height = p.height;
			canvas.width = p.width;

			canvas.style.filter = "progid:DXImageTransform.Microsoft.Matrix(M11="+costheta+",M12="+(-sintheta)+",M21="+sintheta+",M22="+costheta+",SizingMethod='auto expand')";
		} else {
			var canvas = document.createElement('canvas');
			if (!p.oImage) {
				canvas.oImage = new Image();
				canvas.oImage.src = p.src;
			} else {
				canvas.oImage = p.oImage;
			}

			canvas.style.width = canvas.width = Math.abs(costheta*canvas.oImage.width) + Math.abs(sintheta*canvas.oImage.height);
			canvas.style.height = canvas.height = Math.abs(costheta*canvas.oImage.height) + Math.abs(sintheta*canvas.oImage.width);

			var context = canvas.getContext('2d');
			context.save();
			if (rotation <= Math.PI/2) {
				context.translate(sintheta*canvas.oImage.height,0);
			} else if (rotation <= Math.PI) {
				context.translate(canvas.width,-costheta*canvas.oImage.height);
			} else if (rotation <= 1.5*Math.PI) {
				context.translate(-costheta*canvas.oImage.width,canvas.height);
			} else {
				context.translate(0,-sintheta*canvas.oImage.width);
			}
			context.rotate(rotation);
			context.drawImage(canvas.oImage, 0, 0, canvas.oImage.width, canvas.oImage.height);
			context.restore();
		}
		canvas.id = p.id;
		canvas.angle = p.angle;
		p.parentNode.replaceChild(canvas, p);
		
	});
	
	
}

jQuery.fn.rotateRight = function(angle) {
	this.rotate(angle==undefined?90:angle);
}

jQuery.fn.rotateLeft = function(angle) {
	this.rotate(angle==undefined?-90:-angle);
}